Butternut Koláče with Spiced Squash and Halloween Seed Crumble

What Makes This Special

Koláče are traditional Czech yeast cakes. This version is filled with slow-baked butternut squash, autumn spices, and a topping of roasted pumpkin seeds for colour and texture. The orange filling and seed-studded topping reference Halloween and autumn produce.

Ingredients

All ingredients are present for structural, flavour, or aesthetic reasons. Butternut squash provides colour, fibre, and moisture; yeast creates rise; flour forms the matrix; pumpkin seeds echo seasonal themes.

For the Dough

• 250 g plain wheat flour: Provides structure via gluten.
• 40 g granulated sugar: Feeds yeast and tenderizes crumb.
• 7 g instant yeast: Leavens the dough.
• 100 ml whole milk, lukewarm (about 32°C): Hydrates, activates yeast.
• 40 g melted unsalted butter: Softens crumb.
• 1 large egg: Binds and enriches.
• 2 g fine salt: Controls yeast activity and seasons.

For the Squash Filling

• 250 g butternut squash flesh: Provides colour and bulk.
• 30 ml neutral oil: Roasts squash evenly.
• 50 g granulated sugar: Sweetens.
• 1/2 tsp ground cinnamon, 1/4 tsp nutmeg, 1/8 tsp cloves: Autumn flavour profile.
• 2 g fine salt: Balances sweetness and enhances flavour.

For the Halloween Seed Crumble

• 30 g pumpkin seeds, chopped: Texture, colour, and reference to squash.
• 20 g granulated sugar: Forms crisp topping.
• 15 g cold butter: Binds crumble.

Instructions

Step 1: Slow-Roast the Butternut Squash

Preheat oven to 160°C (fan 150°C). Toss peeled, diced squash with oil and spread on a parchment-lined tray. Bake for 50–60 minutes until soft, shrunken, and edges are golden. Roasting at low heat dehydrates and caramelises the squash, intensifying colour and flavour.

Step 2: Mash and Flavour the Filling

Transfer baked squash to a bowl. Mash thoroughly with fork or masher. Stir in 50 g sugar, cinnamon, nutmeg, cloves, and 2 g salt. Mix until smooth. The sugar draws out moisture and the spices distribute more evenly while squash is still warm.

Step 3: Make the Dough

In a large bowl, whisk flour, 40 g sugar, yeast, and 2 g salt. Separately, whisk melted butter, milk, and egg. Pour wet into dry. Mix with a sturdy spoon or hand until just combined. Knead in the bowl or on lightly floured surface for 6–8 minutes until smooth and elastic. Gluten develops through kneading, forming a stretchy network that traps gas.

Step 4: First Proof

Return dough to clean, oiled bowl. Cover with tea towel or plastic wrap. Let rise at room temperature (20–23°C) until doubled, 60–90 minutes. Yeast ferments sugars, producing CO₂ and alcohol, causing dough to expand.

Step 5: Shape Koláče

Line baking tray with parchment. Divide dough into 12 equal pieces (about 40 g each). Roll into balls. Flatten each to a 7–8 cm disc. Place on tray, spaced apart. Cover loosely. Rest for 15 minutes; this relaxes gluten, making shaping easier.

Step 6: Add Filling and Proof Again

Press a deep well into the centre of each disc with fingers or a small glass. Spoon a heaping tablespoon of squash filling into each well. Cover and let rise 30–40 minutes. This final proof gives a lighter crumb.

Step 7: Prepare Halloween Seed Crumble

Chop pumpkin seeds coarsely. In a bowl, rub seeds, 20 g sugar, and cold butter together until mixture resembles clumpy sand. The butter helps the seeds and sugar stick, forming crunchy pieces after baking.

Step 8: Assemble and Bake

Preheat oven to 180°C (fan 170°C). Sprinkle seed crumble generously over the filled koláče. Bake 18–22 minutes until golden and bases sound hollow when tapped. Cool on rack. Baking sets gluten structure and caramelises surface sugar.

Pro Tips

• Roasting squash long and slow prevents watery filling.
• Don’t rush dough proofing; under-proofed dough will be dense, over-proofed will collapse.
• Sprinkle seed crumble just before baking or it will dissolve into filling.

Troubleshooting

Dough won’t rise? Check that milk wasn’t too hot (kills yeast) or too cold (slows fermentation). Instant yeast is reliable but not immortal.

Squash filling too runny? Roast squash longer to evaporate more water. Don’t skip resting after roasting.

Variations

• Use sweet potato instead of butternut for a similar effect.
• Swap pumpkin seeds for sunflower or use a cinnamon sugar only topping.
• Add a small spoon of cream cheese under squash for a richer filling.

Storage

Store in airtight container at room temperature for 24 hours. For longer storage, refrigerate up to 3 days (reheat before eating), or freeze up to 1 month.